Fan-blade mechanism



Aug. 18, 1 925.

N. ECKLES FAN BLADE MECHANISM riled Aug. 15, 1920 ATTORNEY Patented Aug. 18, 1925.

. UNITED STATES,

NOBLE noxnns, or SAN-DIEGO, cAL1roRN1A,'AssIeNoa, BY manor AND nmsim AS;

PATENT OFFICE.

SIGNMENTS, TO monn-ncxnns ELECTRIC MFG. (20., mo, 0F 'LOS marinas, OALI- FORNIA, A CORPORATION OF CALIFQRNIA.

ran-BLADE mncnamsm.

Application filed August 13, 1920. Serial No. 403,186.

To all whom it concern:

Be it known that 'I, NOBLE EQKLES, a citizen of the United States, residing at San Diego, in the county of San Diego and State of California-have invented certain new and useful Fan-Blade Mechanism, of which the following isa specification.

My invention relates to fan'blades for circulatin air for cooling purposes and the objects 0 my invention are: First, to provide a fan blade mechanism so shaped and constructed that a maximum of efliciency is produced; second, to provide a fan blade which i is so constructed and shaped that it provides a minimum of'resistance and a maximum air thrust; third, to provide a fan blade of this class which reduces to a large extent the usual hum of the fan blades thus providing a silentrunni-ng' fan; fourth, to provide a. fan blade mechanism of this class which is so shaped that it is readily constructed of one piece of sheet metal and fifth, to provide a fan blade mechanism'of this class which is very simple and economical of construction, durable, easy to operate, easy to install, efficient in its action and which will not readily deteriorate or get out of order.

With these and other objects in view as will appear hereinafter my invention consists of certain novel features of construe-- tion, combination and arrangement of parts and portions as will be hereinafter. described in detail and particularly set forth in the appended claims, reference being had to the accompanying drawings and to the characters of reference thereon which form a part of this application in which:

Figure l is a perspective view of a fan I motor showing my fan mechanism in operative position thereon; Fig. 2 is an enlarged front elevational view-of my fan mechanism positioned ready for installation on the mo:

tor shaft; Fig. 3 is an edge elevational view at a right angle thereto; Fig. 4 is a sectional view through 4-4 of Fig.2; Fig. 5 is a similar view through5-5 of Fig. 2 and Fig. 6 is asimilar view through 6-6 of Fig. 2.

Similarcharactersof reference refer to similar parts and portions throughout the several views of the drawings.

Mly fan .blade mechanism consists of the blade portions 1 and 2 narrowingcontracting portions 3 and 4:, s ort curve portions 5 The fan blade mechanism isconstructed of thin sheet metal in one piece forming two opposed blades extending in opposite directions from the journal portion. The portions 1 and 2 are broad and curved and are set on an angle in opposite directions from each other, similar to an aeroplane propeller and gradually taper inwardly toward the portlons 3 and 4. The front edges of the blades land 2, whenrevolving, are provided wlth long curves 1 and 2, while theirback edges are provided with short curves 1 and 2 and the front edges of the blades are set back at points 1 and 2 a considerable di tance from the front of the blade mecha- 111SII1 as shown best in Fig.3 of the drawings and the back portions 1 and 2 of the blades, when revolving, are set forward slightly in advance of the base 7 so that the pitch of the blades on the opposite sides gradually increases from the outer end toward the center, while the width of the blades gradually decreases, the metal at the center being bent backwardly as shown best in Figs. 3 and 4. of the drawings, the base 7 being of sufficient width sot'hat the journal member 8 may be secured thereto and the metal rests against the sides of the journal member as shown best in Fig. 4.- of the drawings. The

journal member may be riveted or otherwise secured to the base which is an integral v portion of the blades 1 and 2.

Having thus described my invention what I claim as new and desire to-secure by Letters Patent is:

l. A fan blade, comprising a hub portion .having a front face which lies substantially in a plane of rotation, and a thrust portion in a plane of rotation, and a thrust portion continuous from hub to tip, having its leading edge offset from said plane to a large extent adjacent the hub portion, and elsewhere, to. an extent which gradually'dm'lmishes from thehub portion to the tip, and

fan blade laterally. offset to a large extent at its leading edge relatively to its followmg edge at the hub portion of said blade,

said blade extending outwardly in the shape of a transversely warped plane, the pitch of said blade decreasing outwardly proportionate to its distance from the hub portion, said offset decreasing outwardly from said hub portion.

5. A construction of fan blades, comp-rising a hub portion adapted to receive a driving shaft, and opposed blades carried by said hub portion and shaped to cause the augularity of their working faces at successive cross sections with the planes of rotation of said sections to decrease outwardly -from the hub portion, and having their portions adjacent the hub portion offset therefrom into positions to bear against the shaft.

6. A fan blade mechanism, including a metallic member in general straight line form, ofiset at the middle to form a reinforced hub and provided with oppositely disposed outwardly extending blades having thrust portions from hub to tip in the shape of transversely warped planes the angularity of their working faces at successive crosssections with the planes of rotation of said sections decreasing outwardly from said hub portion.

7. A fan blade mechanism, including a blade member provided with a central channel shaped hub portion and oppositely disposed outwardly extending blade thrust portions integrally secured to said hub portion and shaped from hub to tip in the mannor. of a warped plane generated by substantially straight lines radiating outwardly from saidhub portiorneach transverse line in the working face of a blade being in clined with the plane of' its revolution in inverse proportion to its distance from said hub portion.

8. A fan blade mechanism, including a blade member provided with acentral channel shaped hub portion and oppositely disposed outwardly extending blade thrust portions secured to said hub portion and shaped in the manner of a transversely warped plane generated by substantially straight lines radiating outwardly from said hub portion, the working faces of said thrust portions decreasing in transverse curvature and angularity to the planes of rotation out-- wardly from said hub portion.

9. A device of the class described, including a fan blade longitudinally off-set relatively to the axis of its revolution at its hub portion, its entering edge spaced backwardly a considerable distance from the front face of its hub portion and its trailing edge approximately flush with the face of said hub portion, the cross-section of said blade near its hub portion being so shaped that the portion near its entering edge makes a slight angle with the plane of revolution of the blade, then gradually curves toward and to within a short distance of its trailing edge, gradually increasing its tangential angle with the plane of its revolution and then curves abruptly near its trailing edge in the same general direction making a great angle with its plane of revolution, the angle of the blade near the trailing edge thereof decreasing outwardly from the hub portion.

10. A device of the class described including a fan blade longitudinally off-set relatively to the axis of its revolution at its hub portion, its entering edge spaced backwardly a considerable distance from the front face of its hub portion and its trailing edge approximately flush with the face of said hub portion, the cross-section of said blade near its hub portion being so shaped that the portion near its entering edge makes a slight angle with the plane of revolution of the blade, then gradually curves toward and to within va short distance of its trailing edge, gradually increasing its tangential angle with the plane of its revolution and then curves abruptly near its trailing edge in the same general direction making a great angle with the plane of revolution, the angle of the blade near the trailing edge thereof decreasing outwardly from the hub portion, said blade being formed as a warped plane generated by straight lines radiating outwardly from the hub portion.

11. A device of the class described, including a blade member having a hub portion and blade portions secured thereto and radiating outwardly therefrom,the cross-section of said blade portions near its hub portion being 'so shaped that the portion near its entering edge makes-a slight angle with the plane of revolution of the blade, then gradually curves toward and to within a short distance of its trailing edge, gradually increasing its tangential anglewith the plane of its revolution and then curves abruptly near its trailing edge in the same general direction making a plane .of revolution, t 0 angle of the blade near the trailing edge thereof decreasing outwardly from the hub portion.

t angle with the III 12. A fan blade of the class described, including a blade member having a hub portion and blade portions secured thereto and radiating outwardly therefrom, said hub portion being elongated transversely to its axis of rotation and having side portions extending backwardly from its front face, the leading portion thereof merging with said blade portion in gradual curves, said blade portions being formed in general straight line form radiating from the hub portion, and the curvature and angularity' thereof to the plane of revolution decreasing outwardly from the hub portion.

13. A fan blade of the class described, including a blade member having a hub portion and blade portions secured thereto and radiating outwardly therefrom, said hub portion being elongated transversely to .its axis of rotation and having side portions extending backwardly from its front face, the leading portions thereof extending angularly to the longitudinal axis of the blade portion merging with said blade portion in gradual curves, said blade portions being formed in general straight line form radiating from the'hub portion, and the curvature and angularity thereof to the plane of revolution decreasing outwardly, from the hub portion.

14. A fan blade of the class described, including a blade member consisting of a hub portion and blade portions secured thereto and radiating outwardly therefrom, saidhub portion being elongated transversely to its axis of rotation, the axis of its trans-.

verse elongation extending angularly to the longitudinal axes of said blade portions, the entering edges :of said blade portion near said hub portion being considerably off-set backwardly from the front face of said hub portion and their trailing edges near said hub portion coming substantially flush with the front face of said hub portion, the an ularity of the blades to their plane of revo ution decreasing outwardly from the hub portion. l

, 15., A fan blade of the class described, including a blade member consisting of a hub portion and blade portions secured thereto and radiating outwardly therefrom, said tending outwardly substantially from themiddle of the sides of the elongated hub portion and also being considerably off-set backwardly from the front face thereof, the trailing edges of the blade portions being considerably ofl-set laterally relatively to their plane of revolution and extending outwardly substantially'from the ends of the elongated hub portion.

16. A fan blade of the class described, including a blade member consisting of a hub portion and thin metallic blade portions secured to opposite sides thereof, said hub portion being substantially channel shaped with the flanges forming said channel extending inwardly, and the axis of said channel portion extending angularly to the longitudinal axes of said blade portions.

17. A fan blade of the class described, including a blade member consisting of a hub portion and blade portions secured to opposite sides thereof, said hub portion bein transversely elongated and the axis of sai elongation extending angularly to the longitudinal axes of said blade portions.

18. A fan blade of the class described, including a blade member having a hub portion and blade portions secured theretov and radiating outwardly therefrom, said hub portion being elongated transversely to its axis of rotation and having side portions extending backwardly from its front face, the leading portions thereof connecting with said blade portions, said blade portions being formed in general'straight line form radiating from the hub portion, and the transverse angularity thereof to the plane of revolution decreasing outwardly from the hub portion.

In testimony whereof, I have hereunto set my hand at San Diego, California, this 3rd day of August, 1920.

NOBLE EOKLES. 

